Background: Comprehensive geriatric assessment (CGA) is a multidimensional tool aimed at detecting multiple age-related problems; the study of osteoporotic fractures (SOF) index is a 3-item instrument designed to measure frailty and pre-frailty status. The aim of this prospective cohort study was to evaluate the accuracy of the SOF index and CGA in predicting the disability status in elderly cancer patients. Patients and methods: Patients aged ≥70 years with a confirmed diagnosis of a solid or hematologic tumor underwent both CGA and SOF assessment. The sensitivity and specificity of SOF in determining the presence of frailty were analyzed using the CGA as the reference standard. The diagnostic accuracy of SOF <80% was considered not acceptable. Results: The study involved 400 patients aged ≥70 years (median age 77.2, range 70-97).The SOF and CGA classified, respectively, 33.2% and 31.8% of patients as fit, 67.8% and 68.2% as unfit. The SOF showed a sensibility and a specificity of 89.0 [95% confidence interval (CI) 84.7-92.5] and 81.1 (73.2-87.5) with an accuracy of 86.5 (82.8-89.7). The negative predictive value (NPV) was 103/133, i.e. 77.4% (95% CI 69.4-84.2). Conclusions: As the SOF proved to reach the end-point of our study, we support its use as a means of screening elderly cancer patients in everyday clinical practice.
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